/*
 * Copyright (C) 2023 Square, Inc.
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *       https://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */
package app.cash.zipline.bytecode

import okio.Buffer
import okio.ByteString

fun stripLineNumbers(jsBytecode: ByteArray): ByteArray {
  val jsReader = JsObjectReader(jsBytecode)
  val jsObject = jsReader.use {
    jsReader.readJsObject()
  }

  val strippedJsObject = jsObject.stripLineNumbers()

  val result = Buffer()
  JsObjectWriter(jsReader.atoms, result).use { jsWriter ->
    jsWriter.writeJsObject(strippedJsObject)
  }

  return result.readByteArray()
}

fun JsObject.stripLineNumbers(): JsObject {
  return when (this) {
    is JsFunctionBytecode -> {
      copy(
        debug = debug?.copy(pc2Line = ByteString.EMPTY),
        constantPool = constantPool.map { it.stripLineNumbers() },
      )
    }
    else -> this
  }
}
